Add wires to database

src/game.zig

@@ -149,7 +149,7 @@ var frame_fba_buf: [8192]u8 = undefined;
 var frame_fba = std.heap.FixedBufferAllocator.init(&frame_fba_buf);
 var frame_alloc = frame_fba.allocator();
 
-var db_fba_buf: [1024]u8 = undefined;
+var db_fba_buf: [2046]u8 = undefined;
 var db_fba = std.heap.FixedBufferAllocator.init(&db_fba_buf);
 var db_alloc = db_fba.allocator();
 
@@ -226,9 +226,11 @@ fn loadLevel(lvl: usize) !void {
     {
         _ = try wires.resize(0);
         var a: usize = 0;
-        while (db.getWire(level, a)) |wire| : (a += 1) {
+        while (db.getWire(level, a)) |wireSlice| : (a += 1) {
+            const wire = try world.Wire.getEnds(wireSlice);
             const coord0 = wire[0].coord.subC(levelc);
             const coord1 = wire[1].coord.subC(levelc);
+            w4.tracef("---- Wire (%d, %d), (%d, %d)", coord0.val[0], coord0.val[1], coord1.val[0], coord1.val[1]);
             const p1 = util.vec2ToVec2f(coord0.toVec2() * tile_size + Vec2{ 4, 4 });
             const p2 = util.vec2ToVec2f(coord1.toVec2() * tile_size + Vec2{ 4, 4 });
 
@@ -243,8 +245,8 @@ fn loadLevel(lvl: usize) !void {
             w.begin().pos = p1;
             w.end().pos = p2;
 
-            w.begin().pinned = wire[0].kind == world.EntityKind.WireAnchor;
+            w.begin().pinned = wire[0].anchored;
-            w.end().pinned = wire[1].kind == world.EntityKind.WireEndAnchor;
+            w.end().pinned = wire[1].anchored;
 
             w.straighten();
         }
@@ -530,6 +532,7 @@ pub fn update(time: usize) !State {
     return .Game;
 }
 
+/// Holds data related to selecting/interacting with the world
 const Interaction = struct {
     pos: Vec2,
     details: union(enum) {

src/main.zig

@@ -38,6 +38,7 @@ export fn update() void {
             error.NoLevelUp => showErr(@errorName(e)),
             error.NoLevelLeft => showErr(@errorName(e)),
             error.NoLevelRight => showErr(@errorName(e)),
+            error.MissingEnds => showErr(@errorName(e)),
         },
     };
     if (state != newState) {
@@ -52,6 +53,7 @@ export fn update() void {
                 error.NullTiles => showErr(@errorName(e)),
                 error.SpawnOutOfBounds => showErr(@errorName(e)),
                 error.InvalidLevel => showErr(@errorName(e)),
+                error.MissingEnds => showErr(@errorName(e)),
             },
         }
     }

src/world.zig

@@ -190,6 +190,10 @@ pub const Coordinate = struct {
         return .{ .val = .{ coord.val[0] - other.val[0], coord.val[1] - other.val[1] } };
     }
 
+    pub fn addOffset(coord: Coordinate, val: [2]i4) Coordinate {
+        return .{ .val = .{ coord.val[0] + val[0], coord.val[1] + val[1] } };
+    }
+
     pub fn eq(coord: Coordinate, other: Coordinate) bool {
         return coord.val[0] == other.val[0] and coord.val[1] == other.val[1];
     }
@@ -209,6 +213,10 @@ pub const Coordinate = struct {
         return .{ coord.val[0], coord.val[1] };
     }
 
+    pub fn toOffset(coord: Coordinate) [2]i4 {
+        return .{ @intCast(i4, coord.val[0]), @intCast(i4, coord.val[1]) };
+    }
+
     pub fn fromWorld(x: i8, y: i8) Coordinate {
         return .{ .val = .{
             @intCast(i16, x) * 20,
@@ -429,10 +437,6 @@ pub const AutoTileset = struct {
 pub const EntityKind = enum(u8) {
     Player,
     Coin,
-    WireNode,
-    WireAnchor,
-    WireEndNode,
-    WireEndAnchor,
     Door,
     Trapdoor,
     Collected,
@@ -461,12 +465,109 @@ pub const Entity = struct {
     }
 };
 
-// Data format:
+const WireKind = enum {
-// | level count | node count |
+    Begin,
-// | level headers...         |
+    BeginPinned,
-// | node data...             |
+    Point,
-// | level data...            |
+    PointPinned,
+    End,
+};
 
+/// A wire is stored as a coordinate and at least one point relative to it,
+/// and then an end byte
+pub const Wire = union(enum) {
+    Begin: Coordinate,
+    BeginPinned: Coordinate,
+    /// Relative to the last point
+    Point: [2]i4,
+    /// Relative to the last point
+    PointPinned: [2]i4,
+    End,
+
+    const EndData = struct { coord: Coordinate, anchored: bool };
+
+    pub fn getEnds(wires: []Wire) ![2]EndData {
+        std.debug.assert(wires[0] == .Begin or wires[0] == .BeginPinned);
+        var ends: [2]EndData = undefined;
+        const w4 = @import("wasm4.zig");
+        for (wires) |wire| {
+            switch (wire) {
+                .Begin => |coord| {
+                    ends[0] = .{ .coord = coord, .anchored = false };
+                    ends[1] = ends[0];
+                    w4.tracef("[getEnds] Begin (%d, %d)", coord.val[0], coord.val[1]);
+                },
+                .BeginPinned => |coord| {
+                    ends[0] = .{ .coord = coord, .anchored = true };
+                    ends[1] = ends[0];
+                    w4.tracef("[getEnds] BeginPinned (%d, %d)", coord.val[0], coord.val[1]);
+                },
+                .Point => |offset| {
+                    ends[1] = .{ .coord = ends[1].coord.addOffset(offset), .anchored = false };
+                    const o1 = @intCast(i32, offset[0]);
+                    const o2 = @intCast(i32, offset[1]);
+                    w4.tracef("[getEnds] Point (%d, %d)", o1, o2);
+                },
+                .PointPinned => |offset| {
+                    ends[1] = .{ .coord = ends[1].coord.addOffset(offset), .anchored = true };
+                    const o1 = @intCast(i32, offset[0]);
+                    const o2 = @intCast(i32, offset[1]);
+                    w4.tracef("[getEnds] Point Pinned (%d, %d)", o1, o2);
+                },
+                .End => {
+                    return ends;
+                },
+            }
+        }
+        return error.MissingEnds;
+    }
+
+    pub fn write(wire: Wire, writer: anytype) !void {
+        try writer.writeByte(@enumToInt(wire));
+        switch (wire) {
+            .Begin => |coord| {
+                try coord.write(writer);
+            },
+            .BeginPinned => |coord| {
+                try coord.write(writer);
+            },
+            .Point => |point| {
+                const byte = @bitCast(u8, @intCast(i8, point[0])) | @bitCast(u8, @intCast(i8, point[1])) << 4;
+                try writer.writeByte(byte);
+            },
+            .PointPinned => |point| {
+                const byte = @bitCast(u8, @intCast(i8, point[0])) | @bitCast(u8, @intCast(i8, point[1])) << 4;
+                try writer.writeByte(byte);
+            },
+            .End => {},
+        }
+    }
+
+    pub fn read(reader: anytype) !Wire {
+        const kind = @intToEnum(WireKind, try reader.readByte());
+        switch (kind) {
+            .Begin => return Wire{ .Begin = try Coord.read(reader) },
+            .BeginPinned => return Wire{ .BeginPinned = try Coord.read(reader) },
+            .Point => {
+                const byte = try reader.readByte();
+                return Wire{ .Point = .{
+                    @bitCast(i4, @truncate(u4, 0b0000_1111 & byte)),
+                    @bitCast(i4, @truncate(u4, (0b1111_0000 & byte) >> 4)),
+                } };
+            },
+            .PointPinned => {
+                const byte = try reader.readByte();
+                return Wire{ .PointPinned = .{
+                    @bitCast(i4, @truncate(u4, 0b0000_1111 & byte)),
+                    @bitCast(i4, @truncate(u4, (0b1111_0000 & byte) >> 4)),
+                } };
+            },
+            .End => return Wire.End,
+        }
+    }
+};
+
+/// Used to look up level data
 pub const LevelHeader = struct {
     x: i8,
     y: i8,
@@ -491,6 +592,7 @@ pub fn write(
     writer: anytype,
     level_headers: []LevelHeader,
     entities: []Entity,
+    wires: []Wire,
     circuit_nodes: []CircuitNode,
     levels: []Level,
 ) !void {
@@ -498,6 +600,8 @@ pub fn write(
     try writer.writeInt(u16, @intCast(u16, level_headers.len), .Little);
     // Write number of entities
     try writer.writeInt(u16, @intCast(u16, entities.len), .Little);
+    // Write number of entities
+    try writer.writeInt(u16, @intCast(u16, wires.len), .Little);
     // Write number of circuit nodes
     try writer.writeInt(u16, @intCast(u16, circuit_nodes.len), .Little);
 
@@ -511,6 +615,11 @@ pub fn write(
         try entity.write(writer);
     }
 
+    // Write wire data
+    for (wires) |wire| {
+        try wire.write(writer);
+    }
+
     // Write node data
     for (circuit_nodes) |node| {
         try node.write(writer);
@@ -527,6 +636,8 @@ pub const Database = struct {
     cursor: Cursor,
     level_info: []LevelHeader,
     entities: []Entity,
+    wires: []Wire,
+    wire_count: usize,
     circuit_info: []CircuitNode,
     level_data_begin: usize,
 
@@ -544,6 +655,8 @@ pub const Database = struct {
         const level_count = try reader.readInt(u16, .Little);
         // read number of entities
         const entity_count = try reader.readInt(u16, .Little);
+        // read number of wires
+        const wire_count = try reader.readInt(u16, .Little);
         // read number of nodes
         const node_count = try reader.readInt(u16, .Little);
 
@@ -561,6 +674,16 @@ pub const Database = struct {
             entities[i] = try Entity.read(reader);
         }
 
+        // read wires
+        // Allocate a fixed amount of space since wires are likely to be shuffled around
+        var wires = try alloc.alloc(Wire, 255);
+        {
+            var i: usize = 0;
+            while (i < wire_count) : (i += 1) {
+                wires[i] = try Wire.read(reader);
+            }
+        }
+
         // read circuits
         var circuit_nodes = try alloc.alloc(CircuitNode, node_count);
 
@@ -575,6 +698,8 @@ pub const Database = struct {
             .cursor = cursor,
             .level_info = level_headers,
             .entities = entities,
+            .wires = wires,
+            .wire_count = wire_count,
             .circuit_info = circuit_nodes,
             .level_data_begin = level_data_begin,
         };
@@ -732,20 +857,33 @@ pub const Database = struct {
         db.entities[coin].kind = .Collected;
     }
 
-    pub fn getWire(database: *Database, level: Level, num: usize) ?[2]Entity {
+    pub fn getWire(database: *Database, level: Level, num: usize) ?[]Wire {
         const nw = Coord.fromWorld(level.world_x, level.world_y);
         const se = nw.add(.{ 20, 20 });
-        var node_begin: ?Entity = null;
+        var node_begin: ?usize = null;
         var wire_count: usize = 0;
-        for (database.entities) |entity| {
+        var i: usize = 0;
-            if (!entity.coord.within(nw, se)) continue;
+        while (i < database.wire_count) : (i += 1) {
-            if (entity.kind == .WireNode or entity.kind == .WireAnchor) {
+            const wire = database.wires[i];
-                node_begin = entity;
+            switch (wire) {
-            } else if (entity.kind == .WireEndNode or entity.kind == .WireEndAnchor) {
+                .Begin => |coord| {
-                if (node_begin) |begin| {
+                    if (!coord.within(nw, se)) continue;
-                    if (wire_count == num) return [2]Entity{ begin, entity };
+                    node_begin = i;
+                },
+                .BeginPinned => |coord| {
+                    if (!coord.within(nw, se)) continue;
+                    node_begin = i;
+                },
+                .Point, .PointPinned => continue,
+                .End => {
+                    if (node_begin) |node| {
+                        if (wire_count == num) {
+                            return database.wires[node..i + 1];
                         }
                         wire_count += 1;
+                        node_begin = null;
+                    }
+                },
             }
         }
         return null;

tools/LDtkImport.zig

@@ -58,6 +58,9 @@ fn make(step: *std.build.Step) !void {
     var entity_array = std.ArrayList(world.Entity).init(allocator);
     defer entity_array.deinit();
 
+    var wires = std.ArrayList(world.Wire).init(allocator);
+    defer wires.deinit();
+
     for (ldtk.levels) |level| {
         std.log.warn("Level: {}", .{levels.items.len});
         const parsed_level = try parseLevel(.{
@@ -65,6 +68,7 @@ fn make(step: *std.build.Step) !void {
             .ldtk = ldtk,
             .level = level,
             .entity_array = &entity_array,
+            .wires = &wires,
         });
 
         try levels.append(parsed_level);
@@ -80,6 +84,10 @@ fn make(step: *std.build.Step) !void {
         std.log.warn("{:0>2}: {}", .{ i, node });
     }
 
+    for (wires.items) |node, i| {
+        std.log.warn("Wire {:0>2}: {any}", .{ i, node });
+    }
+
     // Calculate the offset of each level and store it in the headers.
     // Offset is relative to the beginning of level.data
     var level_headers = std.ArrayList(world.LevelHeader).init(allocator);
@@ -109,7 +117,14 @@ fn make(step: *std.build.Step) !void {
     defer data.deinit();
     const writer = data.writer();
 
-    try world.write(writer, level_headers.items, entity_array.items, circuit.items, levels.items);
+    try world.write(
+        writer,
+        level_headers.items,
+        entity_array.items,
+        wires.items,
+        circuit.items,
+        levels.items,
+    );
 
     // Open output file and write data into it
     cwd.makePath(this.builder.getInstallPath(.lib, "")) catch |e| switch (e) {
@@ -127,11 +142,13 @@ fn parseLevel(opt: struct {
     ldtk: LDtk.Root,
     level: LDtk.Level,
     entity_array: *std.ArrayList(world.Entity),
+    wires: *std.ArrayList(world.Wire),
 }) !world.Level {
     const ldtk = opt.ldtk;
     const level = opt.level;
     const entity_array = opt.entity_array;
     const allocator = opt.allocator;
+    const wires = opt.wires;
 
     const layers = level.layerInstances orelse return error.NoLayers;
 
@@ -147,11 +164,12 @@ fn parseLevel(opt: struct {
             std.debug.assert(layer.__type == .Entities);
 
             for (layer.entityInstances) |entity| {
+                var is_wire = false;
                 var kind_opt: ?world.EntityKind = null;
                 if (std.mem.eql(u8, entity.__identifier, "Player")) {
                     kind_opt = .Player;
                 } else if (std.mem.eql(u8, entity.__identifier, "Wire")) {
-                    kind_opt = .WireNode;
+                    is_wire = true;
                 } else if (std.mem.eql(u8, entity.__identifier, "Coin")) {
                     kind_opt = .Coin;
                 } else if (std.mem.eql(u8, entity.__identifier, "Door")) {
@@ -160,21 +178,18 @@ fn parseLevel(opt: struct {
                     kind_opt = .Trapdoor;
                 }
 
+                const levelc = world.Coordinate.fromWorld(world_x, world_y);
                 // Parsing code for wire entities. They're a little more complex
                 // than the rest
                 if (kind_opt) |kind| {
-                    const levelc = world.Coordinate.fromWorld(world_x, world_y);
-                    if (kind != .WireNode) {
                     const entc = world.Coordinate.init(.{
                         @intCast(i16, entity.__grid[0]),
                         @intCast(i16, entity.__grid[1]),
                     });
-                        const world_entity = world.Entity{
+                    const world_entity = world.Entity{ .kind = kind, .coord = levelc.addC(entc) };
-                            .kind = kind,
-                            .coord = levelc.addC(entc)
-                        };
                     try entity_array.append(world_entity);
-                    } else {
+                }
+                if (is_wire) {
                     var anchor1 = false;
                     var anchor2 = false;
                     const p1_c = world.Coordinate.init(.{
@@ -201,18 +216,19 @@ fn parseLevel(opt: struct {
                             };
                         }
                     }
-                        const wire_begin = world.Entity{
-                            .kind = if (anchor1) .WireAnchor else .WireNode,
-                            .coord = p1_c.addC(levelc),
-                        };
-                        try entity_array.append(wire_begin);
 
-                        const wire_end = world.Entity{
+                    if (anchor1) {
-                            .kind = if (anchor2) .WireEndAnchor else .WireEndNode,
+                        try wires.append(.{ .BeginPinned = p1_c.addC(levelc) });
-                            .coord = p2_c.addC(levelc),
+                    } else {
-                        };
+                        try wires.append(.{ .Begin = p1_c.addC(levelc) });
-                        try entity_array.append(wire_end);
                     }
+
+                    if (anchor2) {
+                        try wires.append(.{ .PointPinned = p2_c.subC(p1_c).toOffset() });
+                    } else {
+                        try wires.append(.{ .Point = p2_c.subC(p1_c).toOffset() });
+                    }
+                    try wires.append(.End);
                 }
             }